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[TowerTalk] RFI Radius vs Ant Height

Subject: [TowerTalk] RFI Radius vs Ant Height
From: "Pat Barthelow" <>
Date: Wed, 02 Aug 2006 17:17:23 -0700
List-post: <>
Its been a very long time since I ran an HF KW from a residence.  At a new 
QTH, I am contemplating doing so, using a yagi on a tower, say at 60 ft.  I 
am now at a fairly dense subdivision, shown here on a google map.

Click on:,-121.260095&spn=0.004023,0.010815&t=h&om=1

I am in the house near the center of the aerial photo;  bounded by Lincoln 
Ave to the West, Springview Drive to the East, South Whitney Blvd to the 
North, and Glacier Drive  to the South.

The house has a  race track-shaped blue color,  swimming pool in the back 
yard.   Roughly center of the photo.  As you can see, an arbitrary radius 
circle of say 500 ft, ecompasses a large number of houses, perhaps 60 or 70.

Question is:
What has others experience been while running KW level HF stations, as to 
typical or maximum distances from your station tower/antenna, to homes 
experiencing objectionable RFI to various home electronics.  If say, 500 
feet, in my case I may irritate 60 or 70 households.  If the RFI affected  
radius is larger, I am in even more trouble with neighbors..
Raising the antenna from, (small multiband yagi) say, a  modest 40 ft to, 
say 70 feet... will that ameliorate the neighborhood  RFI very much for an 

Maybe I should think towards building a club/Public Service/Contest oriented 
station at a location near, but out of subdivision interiors.....OR...Going 


73, DX, de Pat AA6EG;
                  Skype:  Sparky599


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